nixpkgs/upstart-jobs/filesystems.nix

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{pkgs, config, ...}:
###### implementation
let
inherit (pkgs) e2fsprogs;
mountPoints = map (fs: fs.mountPoint) fileSystems;
fileSystems = config.fileSystems;
devices = map (fs: if fs ? device then fs.device else "LABEL=" + fs.label) fileSystems;
fsTypes = map (fs: if fs ? fsType then fs.fsType else "auto") fileSystems;
optionss = map (fs: if fs ? options then fs.options else "defaults") fileSystems;
autocreates = map (fs: if fs ? autocreate then fs.autocreate else "0") fileSystems;
mount = config.system.sbin.mount;
job = ''
start on startup
start on new-devices
start on ip-up
script
PATH=${e2fsprogs}/sbin:$PATH
mountPoints=(${toString mountPoints})
devices=(${toString devices})
fsTypes=(${toString fsTypes})
optionss=(${toString optionss})
autocreates=(${toString autocreates})
newDevices=1
# If we mount any file system, we repeat this loop, because new
# mount opportunities may have become available (such as images
# for loopback mounts).
while test -n "$newDevices"; do
newDevices=
for ((n = 0; n < ''${#mountPoints[*]}; n++)); do
mountPoint=''${mountPoints[$n]}
device=''${devices[$n]}
fsType=''${fsTypes[$n]}
options=''${optionss[$n]}
autocreate=''${autocreates[$n]}
isLabel=
if echo "$device" | grep -q '^LABEL='; then isLabel=1; fi
isPseudo=
if test "$fsType" = "nfs" || test "$fsType" = "tmpfs" ||
test "$fsType" = "ext3cow"; then isPseudo=1; fi
if ! test -n "$isLabel" -o -n "$isPseudo" -o -e "$device"; then
echo "skipping $device, doesn't exist (yet)"
continue
fi
# !!! quick hack: if mount point already exists, try a
# remount to change the options but nothing else.
if cat /proc/mounts | grep -F -q " $mountPoint "; then
echo "remounting $device on $mountPoint"
${mount}/bin/mount -t "$fsType" \
-o remount,"$options" \
"$device" "$mountPoint" || true
continue
fi
# If $device is already mounted somewhere else, unmount it first.
# !!! Note: we use /etc/mtab, not /proc/mounts, because mtab
# contains more accurate info when using loop devices.
# !!! not very smart about labels yet; should resolve the label somehow.
if test -z "$isLabel" -a -z "$isPseudo"; then
device=$(readlink -f "$device")
prevMountPoint=$(
cat /etc/mtab \
| grep "^$device " \
| sed 's|^[^ ]\+ \+\([^ ]\+\).*|\1|' \
)
if test "$prevMountPoint" = "$mountPoint"; then
echo "remounting $device on $mountPoint"
${mount}/bin/mount -t "$fsType" \
-o remount,"$options" \
"$device" "$mountPoint" || true
continue
fi
if test -n "$prevMountPoint"; then
echo "unmount $device from $prevMountPoint"
${mount}/bin/umount "$prevMountPoint" || true
fi
fi
echo "mounting $device on $mountPoint"
# !!! should do something with the result; also prevent repeated fscks.
if test -z "$isPseudo"; then
fsck -a "$device" || true
fi
if test "$autocreate" = 1; then mkdir -p "$mountPoint"; fi
if ${mount}/bin/mount -t "$fsType" -o "$options" "$device" "$mountPoint"; then
newDevices=1
fi
done
done
end script
'';
in
{
services = {
extraJobs = [{
name = "filesystems";
inherit job;
}];
};
}